'use strict';

module.exports = core;

const path = require('path')
const semver = require('semver')
const colors = require('colors/safe')
const userHome = require('os').homedir()
const pathExists = require('path-exists').sync

const commander = require('commander')

const pkg = require('../package.json')
const log = require('@ying-cli/log')
const constant = require('./const');
const init = require('@ying-cli/init')
const exec = require('@ying-cli/exec')

const program = new commander.Command()

async function core() {
    try {
        await prepare()
        registerCommand()
    } catch (e) {
        log.error(e.message)
    }
}

function registerCommand() {
    program
        .name(Object.keys(pkg.bin)[0])
        .usage('<command> [options]')
        .version(pkg.version)
        .option('-d, --debug', '是否开启调试模式', false)
        .option('-tp, --targetPath <targetPath>', '是否指定本地调试文件路径', '');

    program
        .command('init [projectName]')
        .option('-f, --force', '是否强制初始化项目')
        .action(exec);

    // 开启debug模式
    program.on('option:debug', function() {
        const opts = program.opts()
        if(opts.debug) {
            process.env.LOG_LEVEL = 'verbose'
        } else {
            process.env.LOG_LEVEL = 'info'
        }
        log.level = process.env.LOG_LEVEL
    })

    // 指定targetPath
    program.on('option:targetPath', function() {
        const opts = program.opts()
        process.env.CLI_TARGET_PATH = opts.targetPath
    })

    // 对未知命令进行监听
    program.on('command:*', function(obj) {
        const availableCommands = program.commands.map(cmd => cmd.name())
        console.log(colors.red('未知的命令：' + obj[0]))
        if(availableCommands.length > 0) {
            console.log(colors.red('可用命令：' + availableCommands.join(',')))
        }
    })

    program.parse(process.argv);
    if(program.args && program.args.length < 1) {
        program.outputHelp()
    }
    
}

async function prepare() {
    // 准备阶段
    checkPkgVersion();
    checkNodeVersion();
    checkRoot();
    checkUserHome();
    checkEnv();
    await checkGlobalUpdate();
}

function checkPkgVersion() {
    log.notice('cli', pkg.version)
}

function checkNodeVersion() {
    // 第一步，获取当前Node版本号
    const currentVersion = process.version
    // 第二步，比对最低版本号
    const lowestNodeVersion = constant.LOWEST_NODE_VERSION
    if(!semver.gte(currentVersion, lowestNodeVersion)) {
        throw new Error(colors.red(`ying-cli 需要安装 v${lowestNodeVersion} 以上版本的Node.js`))
    }
}

function checkRoot() {
    const rootCheck = require('root-check')
    rootCheck()
}

function checkUserHome() {
    if(!userHome || !pathExists(userHome)) {
        throw new Error(colors.red('当前登录用户主目录不存在！'))
    }
}

function checkEnv() {
    const dotenv = require('dotenv')
    const dotenvPath = path.resolve(userHome, '.env')
    if(pathExists(dotenvPath)) {
        dotenv.config({
            path: dotenvPath
        }) 
    }
    createDefaultConfig()
}

function createDefaultConfig() {
    const cliConfig = {
        home: userHome
    }
    if(process.env.CLI_HOME) {
        cliConfig['cliHome'] = path.resolve(userHome, process.env.CLI_HOME)
    } else {
        cliConfig['cliHome'] = path.resolve(userHome, constant.DEFAULT_CLI_HOME)
    }
    process.env.CLI_HOME_PATH = cliConfig.cliHome
}

async function checkGlobalUpdate() {
    // 1、获取当前版本号和模块名
    const currentVersion = pkg.version
    const npmName = pkg.name
    // 2、调用npm API，获取所有版本
    // 3、提取所有版本号，比对哪些版本号是大于当前版本号
    const { getNpmSemverVersion } = require('@ying-cli/get-npm-info')
    const lastVersion = await getNpmSemverVersion(currentVersion, npmName)
    // 4、获取最新的版本号，提示用户更新到该版本
    if(lastVersion && semver.gt(lastVersion, currentVersion)) {
        log.warn('更新提示', 
            colors.yellow(
                `请手动更新${npmName},当前版本：${currentVersion}，最新版本：${lastVersion}
                更新命令：npm install -g ${npmName}`))
    }
}